Updegraff — Flexure of Telescopes. 267 



740 

 Mean Latitude from tliese Observations 43° 4' 36".84±0.022. 



The latitudes from the different pairs of stars grouped, 

 id arranged according t( 

 observed are as follows : — 



and arranged according to the zenith distance of the stars 



0^—10° 43" 4' 36". 75 d=0".06 11 pairs 

 10 —20 

 20 — 30 

 30 —40 

 40 —60 

 60 —70 

 70 —75 



The mean latitude derived from seven years' work with the 

 same instrument (1884 to 1890 inclusive) agrees exactly with 

 the mean latitude given above. The results for each of the 

 seven years, as printed in Vol. VI., Publications of the Wash- 

 burn Observatory, p. 145, are given below: — 



1884.0 43'' 4' 36". 79 



Mean 43° 4' 36". 84 



* This result for latitude is deduced from observations by another ob- 

 server. 



